Ore-roaster.



No. 799,371. PATENTED MAY 9, 1905, J. W. R. LAXTON.

ORE ROASTER.

APPLICATION FILED JAN.19, 1905.

3 SHBETSSHEBT 1.

Figrl Ina/en [54,

0 film WRLaxm 70/ M Zgp L.

No,'789,371. PATENTED MAY 9. 1905.

v .T. W. R. LAXTON.

ORE ROASTER.

APPLICATION-FILED JAN.19, 1905.

3 SHEETS-*SHEET 2.

/ His/"1am No. 789,371. PATENTED MAY 9, 1905.

J. W. R. LAXTON.

ORE ROASTER.

APPLIUATION FILED JAN. 19, 1905.

' 3 SHBETSSHBBT 3.

John %L4&% J1

iviirnn ramps Patented May 9, 1905.

OHE-ROASTIER.

SPECIFICATION forming part of Letters Patent No. 789,371, dated May 9,1905.

Application filed nuary 19, 1905. Serial No. 241,76L

To all whom it may concern:

Be it known that 1, JOHN \VILLIAM RYDER LAx'roN, a citizen of the UnitedStates, and a resident of Lynn, in the county of Essex, State ofMassachusetts, have invented certain new and useful Improvements inOre-Roasters, of which the following is a full, clear, and exactdescription.

Referring to the drawings forming part of this specification, Figure 1is a side view of the apparatus complete. Fig. 2 is a side sectionalview on line Y Y on Fig. 3. Fig. 3 is a sectional view through the lineX X in Fig. 2.

The main part of this ore-roaster consists of a hollow drum 1,preferably of considerably greater diameter than axial length,containing a considerable number of pockets in its periphery and a meansfor supplying a high degree of heat within it. Said pockets 2 are openperipherally, but otherwise closed, as shown in Fig. 2, a slight spacebeing allowed between adjacent pockets.

The means for supplying heat consists, preferably, of a semicylindricalfire-pot 10, fitting within the roaster-drum and supported at its innerend on a trunnion 13, carried by the side 6 of said drum, while itsouter end is supported by suitable fixed framework 14, as shown in Fig.3. The fire is built upon the grate-bars 11, carried by said firepot, adoor 15 giving access thereto. Said drum is revolubly supported atitsside 6 by a comparatively small hub 7; but upon its side 5 is formed alarge hollow hub 1, each of said hubsbeingrevolubly held withinfriction-rolls, preferably three for each, the rolls 30 of the hub 7being suitably supported by the fixed framework, while the roll 31 isdesigned to be elastically pressed against the hub. A similararrangement is provided for the hollow hub 1, the rolls 32 beingsupported by the framework-section 14 and the roll 33 pressed down uponsaid hub by means of the lever 34, pivoted at 35 to the framework, buthaving its opposite end drawn down by the spring 86.

As shown in Fig. 3, the side 6 bellies outward to a considerableproportion beyond the flange 1" of the drum 1, thereby allowing a spacebetween such side and the pockets 2,

while above the upper part of the drums periphery rises a hood 21,having an outletconduit 20, leading to any suitable receiver C for thefumes rising from the roaster. In addition to this hood there is asecond hood, comprising, mainly, a diaphragm 16, penetrated by thehollow hub 1 and inclosing be tween itself and the side 5 a space intowhich are received the products of combustion from the fire within thedrum. This is provided with a suitable smoke-flue 18, passing to anydesired point. To permit the escape of said products of combustion tosaid space, a hole 9 is provided between each two adjacent pockets 2, asshown in Figs. 2 and 3, the same coming quite close to the periphery ofthe drum.

As additional exit 1 form each pocket with a tubular passage 3, reachingentirely through it in a direction parallel with the axis of the drum.Consequently the heated gases rising from the fire first strike thesurfaces of the upper pockets, heating the same to a high degree, andthen pass to the tubular passages 3 and the openings or holes 9 andthrough the same to said space 17. As shown in Fig. 2, the heat musttraverse the entire peripheral surfaces of the pockets to reach theopenings 9, while the passages 3 allow the heat to circulate past oneradial face of each pocket and thence through the interior of the pocketitself.

The operation of this machine is as follows: The crushed ore beingdelivered through the conveyer 2). from any suitable source, as theore-crusher A (indicated in Fig. 1) is received in the pockets 2 as thelatter are revolved beneath the extremity of said conveyer. Each pocketbeing thus partially filled in turn continues to retain such contentsuntil the drum 1 has made substantially a semirevolution, (in thedirection of the hands of a watch, and such contents are bygravitydelivered into the conveyer 23 and carried on to the pulverizer by whichthe ore is prepared for the amalgamators. During this journey of the orein the pockets 2 the steady turning of the latter through an arc ofpractically one hundred and eighty degrees causes the crushed materialto become thoroughly intermixed by the descent,

through gravity, of the particles continuously raised into a position ofunstable equilibrium. In other words, the floor of the pockets beingrough the consequent friction prevents the quantity of ore in eachpocket from sliding bodily along to reach the lowest part thereof newlybrought about by the turn of the drum, and consequently the particlesthemselves must tumble or How one over another to reach such lowestpoint in the turning pocket. This flowing or tumbling of the oreparticles causes them to be continually intermixed to present to theheated floors of the pockets practically every such particle. In thisway the ore is thoroughly heated and all volatile substances containedtherein are expelled before each pocket has completed its journey fromthe conveyer 22 to the conveyer 23.

In addition to the heat imparted to the ore through the floor of thepockets is that communicated thereto from the surfaces of the tubularpassages 3 and still further aiding in the thorough roasting of everyparticle of the ore.

As shown in Fig. 2, the pockets 2 are somewhat elliptical, with themajor axis of each radial with respect to the drum 1. This brings thetube 3 in each case nearer the sides than the bottom of the pocket inwhich it is located. The reason for this is that when each pocket isdirectly over the center of the drum it is of a consequence receivingthe most intense of the heat from the fire beneath and can hencetransmit heat to a correspondingly greater depth of ore than can itssides, which do not receive the flames so directly.

IVhat I claim as my invention, and for which I desire Letters Patent, isas follows, to wit:

1. An ore-roaster consisting of a drum revolving on a horizontal axis,ore-receiving pockets in the periphery of said drum, a heatproducingmeans within said drum, and a hood located over said drum to receive thefumes arising from the roasting ore.

2. An ore-roaster consisting of a drum revolving on a horizontal axis,ore-receiving pockets in the periphery of said drum, a heatproducingmeans within said drum, a hood located over said drum to receive thefumes arising from the ore being roasted, and a hood located to receivethe products of combustion from the ire within said drum.

3. An ore-roaster consisting of a drum revolving on a horizontal axis,ore-receiving pockets in the periphery of said drum, each said pocketbeing substantially cylindrical with its axis parallel with that of saiddrum, and a tubular passage in each said drum and means for supplyingheat within said drum; said tubular passages being arranged to receivethe products of combustion at one end of each thereof and dischargethrough its other end exterior to the drum.

I. An ore-roaster consisting of a drum revolving on a horizontal axis,ore-receiving pockets in the periphery of said drum each separated ashort distance from its neighbors, passages through said pockets openinginto the drum at one end of each and discharging externally, openingsthrough the side wall of said drum near its periphery between saidpockets discharging in the same direction as said passages, means forsupplying heat within said drum, a hood located to receive the fumesarising from said pockets, and a hood located to receive the products ofcombustion from said passages and openings.

5. The combination with a hollow drum formed with peripheral pockets anda hub projecting from each side wall of the drum, one of such hubs beingenlarged and hollow, of friction-rolls supporting said hubs, asemicylindrical lire-pot located within said drum and hollow hub, apivotal support carried by the drum for the inner end of said fire-pot,and alixed support for its outer end, gratebars supported by saidfire-pot, means for the escape of the products of combustion through aside wall of said drum in close proximity to said pockets, and means forseparating the fu mes arising from the ore being roastechfrom the saidproducts of combustion.

6. In an ore-roasting apparatus, a hollow drum revoluble on a horizontalaxis and having a series of pockets in its periphery; each pocket beingformed with one side continuous with one side wall of said drum but witha space between the opposite side and the other side wall of the drum.the remaining wall of each pocket being one continuous curve with itsaxis parallel with the axis of the drum, and a tubular passage beingformed through each pocket parallel with its said curved wall butfarther from the bottom of the pocket than from the curved surfaces moreremoved from said bottom.

In testimony that I claim the foregoing invention l have hereunto set myhand this 29th day of November, 1904.

JOHN WILLLMII RYDER LAX'ION.

I'Vitnesses:

JOHN J. MAoMAHoN, A. B. UPHAM.

